Tool-holder.



e. K. LASS-ITER & P. B. BOGORSELSKI.

TOOL HOLDER.

APPLICATION IILED APR. 3, 1912.

1,038,158, Patented Sept. 10, 1912.

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UNITED STATES PATENT OFFICE.

COLUMBUS K. LASSI'IER AND FRANK E. BOCORSELSKI, OF RICHMOND, VIRGINIA.

TOOL-HOLDER.

Specification of Letters Patent.

Patented Sept. 10, 1912 Application filed Apri13, 1912; Serial No. 688,177.

Our invention relates to means for holding cutting tools, more particularly those which are made of high speed steel and which are required to make comparatively heavy cuts at high cutting speeds, in operative position in lathes and planers, and its object is to provide an appliance of such type which shall be of simple, inexpensive, and substantial construction, and which shall enable the accurate adjustment of the position of the cutting tool to be readily effected, as may, from time to time, become necessary or desirable.

The improvement claimed is hereinafter fully set forth.

In the accompanying drawings: Figure 1 is a side view, partly in section, of a tool holder embodying our invention; Fig. 2, a plan or top view of the same; and, Fig. 3, a transverse section, on the line a a-of Fig. 2.

In the practice of our invention, we provide a tool holder which is preferably made of low carbon or billet steel, and may be case-hardened, if desired, and which comprises a shank or body, 1, shown in this instance as of I section, in order to combine strength and lightness, and an integral head, 1, located at one end of the shank, in which head there is formed a tool carrying slot, perpendicular to the horizontal or longitudinal plane of the shank, the boundaries of which slot are shown by the full and dotted lines w, m, m, m, in Fig. 2, and the ends of which slot are oppositely inclined, at equal angles, to the horizontal plane of the tool holder, their inclination being, in practice, about 80 degrees to said plane.

A bit or cutting tool, 2, of high speed steel, the head of which is forged, in the usual manner, to any shape desired for outing metal in a lathe or planer, is fitted in the slot of the head, 1 of the tool holder, the front of the body of the tool being inclined correspondingly with, and abutting against, the outer end of said slot, and the back of the body of the tool being flat and vertical and abutting against the front of a wedge, 3, the opposite side of which is incllned correspondingly with, and abuts against, the inner end of the slot, and which clamps the body of the tool therein.

The cutting tool, 2, and wedge, 3, are

held firmly in any position in which they may be vertically adjusted in the slot of the tool holder head, by a locking screw, 4, which engages an internal thread, 4, cut partly in the head of the tool holder and partly in the adjacent portion of the Wedge, 3, said screw, when engaged with the internally threaded portions of the, wedge and the tool holder head, preventing movement of the wedge and tool, or either of them, from the position in which the tool may be adjusted for'operation.

It will be seen that, under the construction above described, the cutting tool may be raised and. lowered to accurately suit the work on which it is to operate, with great facility whenever required, and that in anyadjusted position, it is firmly clamped and held by the wedge when driven tight, the movement of the wedge being, in turn, prevented by the locking screw so long as the latter is permitted to remain in engagement with the wedge and tool holder. The complete appliance, ready for operation, canbe made at a small fraction of the cost of a high speed tool having an integral shank of proper size and proportions to provide for its support in a lathe or planer, and presents all the operative advantages of a too-l of such expensive construction.

We claim as our invention and desire to secure by Letters Patent 1. The combination with a cutterholder, comprising a shank and a head integral therewith, the latter having a slot passing therethrough, the sides of said slot being parallel and the ends concave and converging, of a metal-cutting tool fitting in and abutting one end of said slot, a wedge fitting in and abutting the other end of said slot, the adjacent faces of said tool and wedge contacting, and a locking-screw engaging threads formed partially 1n said wedge and partly in the adjacent end of said slot.

2. The combination with acutter-holder,

comprisingan integral shank and head, the in said Wedge and partially in the adjacent latter having a slot passing therethrough end of said slot.

at right angles to the axis of the shank, COLUMBUS K LASSITER the ends of which slotconverge at equal angles, of a metal-cutting tool fitting in one FRANK BOCORSELSKI' end of said slot, a Wedge fitting in the other Witnesses: end and abutting said tool, and a locking A. B. WARREN, screw engaging threads formed partially A. H. WARD.

Copies of this patent may be obtained for fiv e cents each, by addressing the Commissioner of Patents,

' Washington, D. C. 

